SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Hydrogels and Microgels

CPP 3.4: Vortrag

Montag, 27. März 2023, 10:15–10:30, ZEU 255

Incorporation of Hydrophilic Microgels at Water in Oil Emulsion stabilized by Hydrophobic Nanospheres — •Sebastian Stock, Carina Schneider, Luca Mirau, Franziska Braun, and Regine von Klitzing — TU Darmstadt, Darmstadt, Germany

For particle-stabilized emulsions (Pickering emulsions, PEs), the affinity of the particular stabilizers to one or the other liquid decides about the resulting emulsion type - either oil in water (o/w) or water in oil (w/o). Besides specific exceptions, hydrophilic microgel particles (MGs) are only able to stabilize o/w emulsions. However, the w/o emulsion type is preferable in a multitude of applications ranging from the food industry over medicine towards interfacial catalysis. We solved this problem by using well-characterized, hydrophobic, positively charged, spherical silica particles (SNs) and hydrophilic, positively charged PNIPAM MGs to stabilize water in 1-dodecene emulsions simultaneously. Using these thoroughly characterized model particles allows deep insights into the interplay between soft and solid particles at the interface and the structure formation of the PEs. The interaction between different kinds of particles was studied on a Langmuir trough in combination with AFM measurements. The observable structure formation at the interface of the Langmuir Trough could explain the particle assembly at the droplet interfaces in PEs.